subclass

问题 I tried to subclass SKSpriteNode into GameObject and I would like to instantiate objects outside the game scene class. Here is my GameObject code derived from SKSpriteNode : import SpriteKit public class GameObject: SKSpriteNode { init( texture: SKTexture?, color: UIColor, size: CGSize, position:CGPoint, name:String ) { objectSize = size; objectName = name; objectSprite = texture; //call superclass here super.init(texture: texture, color: color, size: size); self.position = position; }

问题 I hope this is a simple question. I need to intercept didAddSubview , but will I need to subclass the UIView in order to override that method? The UIView that I want to override is the UIViewController 's view property, so I just want to know how to go about working with this. Thanks! 回答1: From Apple UIView documentation (see Methods to Override ): When subclassing UIView, there are only a handful of methods you should override and many methods that you might override depending on your needs.

问题 I have implemented a Parse subclass called Filler.swift that contains five variables that are held in the Parse backend. Whilst trying to save data to the Parse backend using this subclass I get the error: fatal error: unexpectedly found nil while unwrapping an Optional value . This is the code that brings about the error (on the self.object.username = username line): if let username = PFUser.currentUser()?.username { // set username equal to current user self.object.username = username }else

问题 Subclassing: http://scottbarnham.com/blog/2008/08/21/extending-the-django-user-model-with-inheritance/ User Profiling: https://docs.djangoproject.com/en/dev/topics/auth/#storing-additional-information-about-users Which one is more efficient and less of a hassle? And Which way should I go if I plan to scale big? 回答1: Don't use subclassing unless you're prepared to 1) write your own auth backend, and 2) forgo ever using a different auth backend. 回答2: It seems to makes sense to have the simplest

问题 Subclassing: http://scottbarnham.com/blog/2008/08/21/extending-the-django-user-model-with-inheritance/ User Profiling: https://docs.djangoproject.com/en/dev/topics/auth/#storing-additional-information-about-users Which one is more efficient and less of a hassle? And Which way should I go if I plan to scale big? 回答1: Don't use subclassing unless you're prepared to 1) write your own auth backend, and 2) forgo ever using a different auth backend. 回答2: It seems to makes sense to have the simplest

问题 I have created the subclass below to link my swiftui code to my storyboard. The goal is to have a vstack with text containers in it display inside a ContainerView. I am not sure if I am using the right class: NSViewController? I do not get any errors, but the code does not display how I want it to. Mostly, The swiftui does not display inside the window that shows up when I run the app. import SwiftUI class termu: NSViewController { override func viewDidLoad() { super.viewDidLoad() // Do view

问题 I've got a custom class called 'Quad' which creates a textured quad to use as a sprite in my 2D OpenGL ES 2.0 game. public class Quad(){ //Quad creation stuff here } Then I have a separate subclass (i.e. in a different file - not an innerclass) public class hero extends Quad(){ //Variables relating specifically to this character int heroX = 0; int heroY = 0; } I create my object like so: Quad hero = new Hero(); However, if I attempt to access the 'heroX' and 'heroY' variables, I get nothing..

问题 I have a base class, a bunch of subclasses, and for each of these subclasses, I have another set of sub-subclasses. For example: class BaseClass(object): def __init__(self): with open(config.txt) as f self.config_array = f.readlines() class FirstOrderSubClass(BaseClass): def __init__(self, name): self.name = name class SecondOrderSubClass(FirstOrderSubClass): def __init__(self, name, version): self.name = name self.version = version super(SecondOrderSubClass, self).__init__(self.name) #

问题 I have already created a class and a subclass and have a bunch of code in both. I've created an interface in the parent class and I have no idea how to make my child class implement the interface :/ The code is: class Car { public interface ISmth { void MyMethod(); } } class MyCar : Car { //implement the interface } 回答1: This is how your code should probably be laid out. public interface ISmth { void MyMethod(); } class Car { } class MyCar : Car, ISmth { public void MyMethod() { } } There

问题 I have already created a class and a subclass and have a bunch of code in both. I've created an interface in the parent class and I have no idea how to make my child class implement the interface :/ The code is: class Car { public interface ISmth { void MyMethod(); } } class MyCar : Car { //implement the interface } 回答1: This is how your code should probably be laid out. public interface ISmth { void MyMethod(); } class Car { } class MyCar : Car, ISmth { public void MyMethod() { } } There